…and what about Smite a Card from Olympus Fluxx?
A: If you want to take away everyone’s ability to use that Action, of course you can always Zap (or Smite) the Rule: Let’s Keep Doing that (LKDT) into your hand, and discard the associated Action, but what if it’s the Action you want to Zap into your hand for yourself, and not the Rule it’s attached to? (Or in the case of Smite a Card, what if you want to be able to keep doing something, just… not that.)
Yes, you can just Zap that Action into your hand. You then get to choose a different Action from the discard pile to attach to Let’s Keep Doing That. “But!” I hear you cry, “What happens if there are no Actions in the discard pile?”
For the similar Smite a Card, however, things are a bit different. You are probably targeting the Action on LKDT so that you can change it to something else, but when you Smite something, it goes into the discard pile, not your hand. So if you Smite that Action, and it’s the only Action there, you’ll have no choice but to re-attach it, accomplishing nothing. If that’s the case… maybe you want to Smite something else.
To avoid that awkward situation, remember, you can look through the discard pile at any time, so go right ahead and check before you Smite the Action attached to LKDT.